公开(公告)号：US4625170A

公开(公告)日：1986-11-25

申请号：US635154

申请日：1984-07-27

Applicant: Etsuji Yamamoto ,  Shigeru Matsui ,  Masuo Kuroda ,  Hideki Kohno

Inventor： Etsuji Yamamoto ,  Shigeru Matsui ,  Masuo Kuroda ,  Hideki Kohno

IPC: G01R33/20 ,  A61B5/055 ,  A61B10/00 ,  G01R33/48 ,  G01R33/565

CPC classification number: G01R33/56518

Abstract: An NMR imaging method and apparatus of the type in which a 180-degree RF pulse is applied to generate a spin echo after the selective excitation of a spin by a 90-degree RF pulse. A dummy gradient field, which has the same direction and intensity as those of a gradient field to be applied when the spin echo is observed, is applied between said 90-degree RF pulse and said 180-degree RF pulse so that the instant of starting the application of the gradient field for signal observation is advanced to the extent corresponding to said dummy gradient field.

Abstract translation: 一种NMR成像方法和装置，其中施加180度RF脉冲以在旋转选择性激发90度RF脉冲之后产生自旋回波。 在所述90度RF脉冲和所述180度RF脉冲之间，施加与观察到自旋回波时要施加的梯度场相同的方向和强度的虚拟梯度场，使得起始时刻 将用于信号观察的梯度场的应用提前到对应于所述虚拟梯度场的程度。